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• C# process and ffmpeg output pipe

  21 novembre 2018, par Konrad

  I’m trying to replicate the following call from command line in C# :

  C:\Temp\Proj\FFmpeg\bin\ffmpeg.exe -re -i C:\test\test.ts -map data-re -codec copy -f data - | java -jar C:\Temp\Proj\FFmpeg\bin\AnotherProj.jar 1

  As you can see, FFmpeg pipes the data into an app built with Java. And my implementation :

  var x = RunCmdProcess($"/C {_ffmpegPath} -re -i {_videoPath} - map data-re -codec copy -f data - | java -jar {_anotherProjPath} 1", out outputMessage);
  
  
  
  protected Process RunCmdProcess(string arguments, out string outputMessage)
  
              {
  
                  ProcessStartInfo p = new ProcessStartInfo("cmd.exe");
  
                  p.RedirectStandardOutput = true;
  
                  p.RedirectStandardError = true;
  
                  p.RedirectStandardInput = true;
  
                  p.UseShellExecute = false;
  
                  p.CreateNoWindow = true;
  
                  p.WindowStyle = ProcessWindowStyle.Hidden;
  
                  p.Arguments = arguments;
  
  
  
                  var sb = new StringBuilder();
  
  
  
                  var x = Process.Start(p);
  
  
  
                  var stdOut = x.StandardOutput.ReadToEnd();
  
                  var stdErr = x.StandardError.ReadToEnd();
  
  
  
                  sb.Append(stdOut);
  
                  if (!string.IsNullOrEmpty(stdErr)) sb.Append(stdErr);
  
                  x.WaitForExit();
  
                  outputMessage = sb.ToString();
  
                  return x;
  
              }

  The result of the following call is :

  [NULL @ 0000028335e82380] Unable to find a suitable output format for ’pipe :’
  pipe: : Invalid argument

  I double checked the paths to the files given in the RunCmdProcess function as well as tried enclosing the arguments (after /C) with quotation marks. No matter what I try, I still get the same error from FFmpeg.

• FFMPEG rgb image from named pipe in to h256 rawvideo out to named pipe out

  12 octobre 2018, par Evren Bingøl

  I am forking an ffmpeg and piping in rgb0 images and read hvec rawvideo (h256 frames) out.

  This is the command I am using

  ffmpeg -y -video_size 176x144 -f rawvideo -pix_fmt rgb0 -i 
  
  \\\\.\\pipe\\my_pipe  -c:v libx265   -f rawvideo  \\\\.\\pipe\\my_pipe_out

  The issue is I never hear anything in ffmpeg when I try to read the pipe, so ffmpeg is not spitting anything out.

  When piping data into ffmpeg, I would assume that ffmpeg knows by the format parameter that it is rgb, and by the dimensions parameter, its size and calculates when a certain amount of data it received from pipe in is a full frame rgb image, processes it, and spits back hvec from pipe out.

  But it blocks as if it is accepting more data even though a full rgb image is piped in.

  Is what I am trying to do doable ?

• Proper way to pipe raw video to ffmpeg in c#

  11 octobre 2018, par Wahid Masud

  In my Asp.NET MVC app I’m trying to pipe the video from Request.Files[] to the ffmpeg.exe process. The code produces an output file, but I’m getting a static video, no contents there. And I’m not sure if the problem is in the arguments or in the code.

  var request = System.Web.HttpContext.Current.Request;
  
  var stream = request.Files["upload"].InputStream;
  
  var ffmpeg = System.Web.HttpContext.Current.Server.MapPath("~/FFMpeg/ffmpeg.exe");
  
  var outputDir = System.Web.HttpContext.Current.Server.MapPath("~/Uploads/converted.mp4");
  
  
  
  var inputArgs = "-f rawvideo -pix_fmt rgb32 -video_size 1280x720 -i -";
  
  var outputArgs = "-vcodec libx264 -crf 23 -pix_fmt rgb32 -preset ultrafast " + outputDir;
  
  
  
  var process = new Process
  
  {
  
      StartInfo =
  
      {
  
          FileName = ffmpeg,
  
          Arguments = $"{inputArgs} {outputArgs}",
  
          UseShellExecute = false,
  
          CreateNoWindow = true,
  
          RedirectStandardInput = true
  
      }
  
  };
  
  
  
  process.Start();
  
  
  
  var ffmpegIn = process.StandardInput.BaseStream;
  
  
  
  // Write Data
  
  byte[] buffer = new byte[stream.Length];
  
  stream.Read(buffer, 0, (int)stream.Length);
  
  ffmpegIn.Write(buffer, 0, (int)stream.Length);
  
  
  
  ffmpegIn.Flush();
  
  ffmpegIn.Close();  

  The video size is always 1280x720 but framerate may vary, so I’m not sure if the inputArgs is right. Any suggestions would be appreciated.